EP1741908B1 - Engine control apparatus - Google Patents

Engine control apparatus Download PDF

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Publication number
EP1741908B1
EP1741908B1 EP06013736A EP06013736A EP1741908B1 EP 1741908 B1 EP1741908 B1 EP 1741908B1 EP 06013736 A EP06013736 A EP 06013736A EP 06013736 A EP06013736 A EP 06013736A EP 1741908 B1 EP1741908 B1 EP 1741908B1
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EP
European Patent Office
Prior art keywords
fuel
engine
evaporation rate
detecting means
control apparatus
Prior art date
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Expired - Fee Related
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EP06013736A
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German (de)
English (en)
French (fr)
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EP1741908A1 (en
Inventor
Shinji Nakagawa
Kozou Katogi
Minoru Oosuga
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Hitachi Ltd
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Hitachi Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/047—Taking into account fuel evaporation or wall wetting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/286—Interface circuits comprising means for signal processing
    • F02D2041/288—Interface circuits comprising means for signal processing for performing a transformation into the frequency domain, e.g. Fourier transformation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0611—Fuel type, fuel composition or fuel quality
    • F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions

Definitions

  • the present invention relates to an engine control apparatus, and more preferably to an engine control apparatus adapted to detect fuel property and a residual fuel quantity in an engine and control the engine optimally on the basis of detected information.
  • fuels show a certain extent of variation in their property, and the evaporation rate at low temperature varies with their properties. Since the optimum fuel quantity at engine start-up changes with different fuel evaporation rates, a number of methods have been proposed for fuel property detection, but in most of those methods, the fuel property is detected during a start-up of the engine from a point of view of early-stage detection. Here again, the residual fuel is a major disturbance to detection of fuel property.
  • Patent Document JP-A-7-27010 there is disclosed an engine control apparatus which detects a change rate ⁇ Ne of engine revolution speed, and determines the heaviness of fuel based on ⁇ Ne and charge efficiency with reference to a map made up of water temperature, intake air temperature, and atmospheric pressure.
  • This control apparatus operates on a principle that by detecting ⁇ Ne, namely, a combustion torque, a fuel evaporation rate (burned fuel quantity or air-fuel ratio in combustion) is obtained, and a fuel property is detected indirectly according to the fuel evaporation rate.
  • Patent Document JP-A-8-177556 reveals a control apparatus in which an evaporation time constant i representing a temporal change in fuel quantity sucked from the inlet system into the cylinder (combustion chamber) of the engine is calculated based on an evaporation rate time constant ⁇ 0 at a reference engine revolution speed and a reference engine load.
  • the Patent document JP-A-2001-107795 discloses a control apparatus which determines a fuel property on the basis of a relation between a fuel injection quantity or a parameter correlated with the fuel injection quantity and a fuel combustion quantity or a parameter correlated with the fuel burned quantity when a predetermined condition is established (during idle operation, for instance).
  • JP-A-7-27010 because the residual fuel existing in the intake passage and the cylinder burns together with fuel supplied from the fuel injection valve at the start of the engine, the burned fuel quantity or the air-fuel ratio in combustion changes according to the residual fuel quantity. Therefore, the fuel evaporation rate apparently is changed according to this residual fuel quantity, which results in a detection error, in other words, a misdetection of the fuel property.
  • JP-A-8-177556 mentioned above indicates that this technology does not detect the quantity of fuel already existing in the cylinder or the intake passage before the engine is started, and is unable to solve the above-described problem.
  • the fuel combustion quantity is detected chiefly based on the A/F ratio detected from the exhaust gas and this detection occurs following passage of a certain period of time after the engine is started during idle operation, for example, as described above.
  • the fuel remaining in the intake passage or cylinder before start-up of the engine, of which a question was raised, is burned in a short time after the engine is started, and this detection is conducted after passage of a certain length of time from the time when the engine is started. Therefore, the fuel property can be detected under conditions less likely to be affected by the residual fuel, but the residual fuel quantity cannot be detected either positively or quantitatively.
  • the present invention has been made with the foregoing circumstances taken into consideration, and has as its object to provide an engine control apparatus capable of setting a parameter such as an optimum fuel injection quantity at the start of the engine by separating and detecting a fuel and its property remaining in the intake passage and the cylinder before the engine is started and thus make the emission performance and the running performance during start-up compatible.
  • the control apparatus comprises means of detecting or estimating a burned fuel quantity of an engine; means for separating the detected estimated burned fuel quantity and separately detecting a burned fuel quantity of fuel supplied from a fuel injection valve and a burned quantity of fuel other than the burned fuel quantity supplied from the fuel injection valve.
  • a detected or estimated burned fuel quantity of the engine is separated into a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the burned fuel quantity supplied from the fuel injection valve and separate combustion fuel quantities are detected to make it possible to detect the condition of the fuel combustion system with high accuracy.
  • the burned fuel quantity detecting or estimating means includes a first detecting means for detecting an initial burned fuel quantity or a fuel evaporation rate; and a second detecting means for detecting a second burned fuel quantity or a fuel evaporation rate, and wherein the separating and detecting means includes means for estimating a burned quantity of fuel other than a fuel supplied from the fuel injection valve on the basis of detection results from the first and second detecting means.
  • the means for separating and detecting a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than a fuel supplied from the fuel injection valve includes, for example, a first (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting a burned fuel quantity including both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the fuel supplied from the fuel injection valve, and a second (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting only a burned fuel quantity supplied from the fuel injection valve, wherein a burned quantity of fuel other than a fuel supplied from the fuel injection valve is obtained from, for example, a difference between detection results (detected values, for example) of both detecting means.
  • the separating and detecting means is adapted to estimate a burned quantity of fuel other than a fuel supplied from the fuel injection valve on the basis of a difference or ratio between detection results of the first and second detecting means.
  • the separating and detecting means includes a first (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting a burned fuel quantity including both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than a fuel supplied from the fuel injection valve and a second (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting only a burned fuel quantity supplied from the fuel injection valve, wherein a burned quantity of fuel other than a fuel supplied from the fuel injection valve is obtained on the basis of a difference or a ratio between detection results (detected values, for example) of both detecting means.
  • a first (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting a burned fuel quantity including both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than a fuel supplied from the fuel injection valve
  • a second (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting only a burned fuel quantity supplied from the fuel
  • the separating and detecting means is adapted to detect a residual fuel quantity existing in a cylinder, an air-intake passage, and exhaust passage before the engine is started as a burned quantity of fuel other than a fuel supplied from the fuel injection valve.
  • the separating and detecting means includes means for estimating a fuel property on the basis of a detection result of the first or second detecting means. (Refer to Fig. 3 .)
  • the separating and detecting means includes a second (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting only a burned fuel quantity supplied from the fuel injection valve, and an amount of change in the burned fuel quantity or the evaporation rate in this case is obtained from the fuel property not of the residual fuel but of the fuel supplied from the fuel injection valve.
  • the separating and detecting means is adapted to obtain a fuel property on the basis of the second fuel evaporation rate when the second fuel evaporation rate is lower than the first fuel evaporation rate, and obtains a residual fuel quantity on the basis of a difference or a ratio between the first fuel evaporation rate and the second fuel evaporation rate.
  • the description of the second aspect is equally applicable to the sixth aspect, for example, when the separating and detecting means includes means for a first (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting a burned fuel quantity including both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the fuel supplied from the fuel injection valve, a second (a combustion quantity and a fuel evaporation rate) detecting means for detecting only the burned fuel quantity supplied from the fuel injection valve, the separating and detecting means obtains a residual fuel quantity as the burned quantity of fuel other than the fuel supplied from the fuel injection valve on the basis of a difference or a ratio between detection results (detected values, for example) from both detecting means.
  • a first (a burned fuel quantity or a fuel evaporation rate) detecting means for detecting a burned fuel quantity including both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the fuel supplied from the fuel injection valve
  • control apparatus further comprises means for calculating a parameter related to engine control on the basis of a detection result of the separating and detecting means.
  • a residual fuel quantity is separated out, and this residual fuel quantity and a fuel property, which have effects on the exhaust performance and the running performance during start-up, are detected according to the foregoing aspects, and on the basis of detection results, a parameter related to engine control, such as a burned fuel quantity during start-up of the engine, is optimized.
  • a period where a detection result is affected by both changes in burned fuel quantity caused by the residual fuel and changes in burned fuel quantity caused by the fuel property is used as a detection period
  • the second detecting means is adapted to use a period where there are effects of change in burned fuel quantity caused by the fuel property as a detection period.
  • detection results by the first detecting means obtained during a predetermined time after the start-up of the engine include both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the fuel supplied from the fuel injection valve (a residual fuel quantity).
  • detection results by the second detecting means obtained after passage of a predetermined time from the start-up of the engine are not affected by the residual fuel quantity but affected only by the burned quantity of fuel supplied from the fuel injection valve, in other words, by its fuel property. In this manner, burned fuel quantities are detected in different periods where degrees of effects of effect factors are different, and by comparing detection results, the effects of the residual fuel and the effects of the fuel property are separated.
  • the first detecting means detects a burned fuel quantity or a fuel evaporation rate during a passage of a predetermined time after the start of the engine and the second fuel evaporation rate detecting means detects a burned fuel quantity or a fuel evaporation rate after passage of a predetermined time after the engine is started.
  • the first detecting means detects a burned fuel quantity or a fuel evaporation rate when an engine cooling water temperature is less than or equal to a predetermined temperature A
  • the second detecting means detects a burned fuel quantity or a fuel evaporation rate when the cooling water temperature is less than or equal to a predetermined cooling water temperature B.
  • the temperature is indicated in the detecting conditions.
  • the moment the engine is started which is a start point of measuring an elapse time, is set at a time point when the engine speed is greater than zero.
  • the first and/or second detecting means is adapted to detect a burned fuel quantity and/or a fuel evaporation rate on the basis of the engine speed.
  • the first and/or second detecting means detects a burned fuel quantity and/or a fuel evaporation rate on the basis of an exhaust component of the engine.
  • a fuel evaporation rate (a burned fuel quantity or an air-fuel ratio in combustion) is obtained.
  • the first detecting means is adapted to detect a burned fuel quantity and/or a fuel evaporation rate on the basis of time TO from when the engine speed becomes greater than or equal to a predetermined value C until the engine speed becomes greater than or equal to a predetermined value D.
  • the description of the eighth aspect is equally applicable to the description of the eighth aspect. Because the residual fuel left in the cylinder or the like before start-up is burned in a short time after start-up of the engine, detection by the first detecting means that occurs during a predetermined time after start-up of the engine is based on time TO from when the engine speed becomes greater than or equal to a predetermined value C until the engine speed becomes greater than or equal to a predetermined value D.
  • the predetermined value C may be a value a little larger than an engine speed obtained by a starter motor, for example, namely, an engine speed attained by a so-called initial combustion
  • the predetermined value D may be a value corresponding to complete combustion (1000rpm), for example.
  • the first detecting means detects a burned fuel quantity and/or a fuel evaporation rate on the basis of time T1 from initial combustion of the engine until the engine reaches a predetermined number of engine revolutions.
  • the eighth and 14th aspects are applicable to the 15th aspect. It is clearly described that the residual fuel left in the cylinders or the like is burned in a short time after the start of the engine and therefore detection by the first detecting means in a predetermined time after the start of the engine is carried out on the basis of time T1 from initial combustion of the engine until a predetermined number of engine revolutions is reached.
  • the first detecting means detects a burned fuel quantity and/or a fuel evaporation of the engine on the basis of time T2 from initial combustion of the engine until the engine speed settles in a predetermined range and becomes stable.
  • the eighth aspect and the 14th aspect are applicable to the 16th aspect. It is clearly described that the residual fuel left in the cylinders or the like before start-up is burned in a short time after the start of the engine and therefore detection by the first detecting means is carried out during a predetermined time after the start of the engine on the basis of time T2 from initial combustion of the engine until the engine speed settles into a predetermined range and becomes stable.
  • the second detecting means detects a burned fuel quantity and/or a fuel evaporation rate after the engine speed reaches a predetermined number of revolutions after the initial combustion of the engine occurred.
  • the residual fuel left in the engine before start-up is burned in a short time after the start of the engine and therefore a result of detection by the first detecting means in a predetermined time after the start of the engine includes both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the fuel supplied from the fuel injection valve (a residual fuel quantity).
  • a result of detection by the second detecting means performed after passage of a predetermined time after the start of the engine is not affected by the residual fuel quantity but is affected by the burned fuel quantity supplied from the fuel injection valve, namely, by the fuel property. Accordingly, in this aspect, it is clearly described that detection by the second detecting means is performed after a predetermined number of engine revolutions is reached after the occurrence of initial combustion of the engine.
  • the second detecting means is adapted to detect a burned fuel quantity and/or a fuel evaporation rate after the engine speed settles into a predetermined range and becomes stable.
  • the first detecting means detects a burned fuel quantity and/or a fuel evaporation rate on the basis of an integrated value of the engine speed and/or a maximum value of the engine speed in a period from when the engine speed is greater than or equal to a predetermined value C until the engine speed is greater than or equal to a predetermined value D.
  • a fuel evaporation rate (a burned fuel quantity or an air-fuel ratio in combustion) is obtained.
  • the second fuel evaporation rate detecting means is adapted to detect a burned fuel quantity and/or a fuel evaporation rate on the basis of change in the engine speed.
  • a fuel evaporation rate (a burned fuel quantity) is obtained.
  • the first and/or second detecting means is adapted to detect a burned fuel quantity and/or a fuel evaporation rate on the basis of a concentration of HC (hydrocarbon) and/or CO (carbon monoxide) as exhaust components of the engine.
  • control apparatus utilizes a HC concentration and/or a CO concentration is correlated with an air-fuel ratio in combustion.
  • a fuel evaporation rate (a burned fuel quantity) can be obtained.
  • the first and/or second detecting means is adapted to detect a burned fuel quantity and/or a fuel evaporation rate on the basis of an air-fuel ratio as an exhaust component of the engine.
  • a fuel evaporation rate (a burned fuel quantity) is obtained.
  • the second detecting means includes means for directly or indirectly detecting a response characteristic of from fuel injection into the engine up to an exhaust component, and therefore is adapted to detect a burned fuel quantity or a fuel evaporation rate on the basis of the response characteristic.
  • a fuel evaporation rate is detected by using a phenomenon that the response characteristic of from fuel injection to an exhaust component changes according to the fuel property (fuel evaporation rate).
  • the response characteristic is detected in time domain, such as step response time.
  • the fuel injection quantity is changed in a step manner, and according to a response time (63.4%, 90%, for example) obtained as a result, a fuel evaporation rate is detected. It is clearly described that though response time is detected by a process in time domain, some other response characteristic to be processed in time domain may be applied in principle.
  • the above-mentioned response characteristic may be a frequency response characteristic to be detected in time domain.
  • a predetermined frequency has only to be in a frequency band where a difference in the fuel property can be separated.
  • a gain characteristic decreases at frequencies greater than or equal to a cutoff frequency and stays at about 1 at not more than the cutoff frequency. The cutoff frequency changes with different fuel properties.
  • amplitude characteristic and phase characteristic are processed in frequency domain, some other response characteristic to be processed in frequency domain may be applied in principle.
  • a fuel injection quantity at start of the engine is set on the basis of the residual fuel quantity.
  • the residual fuel is burned together with a fuel supplied from the fuel injection valve when the engine is started, the residual fuel works as a disturbance to start-up control, resulting in deterioration of the exhaust performance.
  • the engine control apparatus comprises means for notifying the detected residual fuel quantity and/or the fuel property.
  • a residual fuel quantity is separated out, and this residual fuel quantity and a fuel property are detected in each of the foregoing aspects, and means for notifying detection results to the passengers or outside people is provided.
  • means is provided to decide and notify that an abnormality has occurred in the fuel system when an elapsed time from a stoppage to a start of the engine is less than or equal to a predetermined value and the detected residual fuel quantity is greater than or equal to a predetermined value.
  • means is provided to obtain a fuel property on the basis of a second fuel evaporation rate when a second fuel evaporation rate detected by the second detecting means is higher than a first fuel evaporation rate detected by the first detecting means and to decide that engine abnormality has occurred which will aggravate the fuel evaporation rate on the basis of a difference or a ratio between the first fuel evaporation rate and the second fuel evaporation rate.
  • detection results by the first detecting means obtained during a predetermined time after the start-up of the engine include both a burned fuel quantity supplied from the fuel injection valve and a burned quantity of fuel other than the fuel supplied from the fuel injection valve (a residual fuel quantity).
  • detection results by the second detecting means obtained after passage of a predetermined time after the start-up of the engine are not affected by the residual fuel quantity but affected only by the burned fuel quantity supplied from the fuel injection valve, in other words, the fuel property.
  • the fuel evaporation rate obtained by the first detecting means is apparently higher by an amount corresponding to the residual fuel quantity than the fuel evaporation rate obtained by the second detecting means.
  • this relation is reversed, in other words, if the fuel evaporation rate obtained by the first detecting means is apparently lower than the fuel evaporation rate obtained by the second detecting means, a decision is made that engine abnormality has occurred, which will aggravate the fuel evaporation rate.
  • the above-mentioned decision means is adapted to decide that the fuel intake efficiency is aggravated due to fuel deposits formed in the intake valve and take countermeasures.
  • an automobile according to the present invention is equipped with the control apparatus described above.
  • the fuel, remaining in the cylinder and the intake passage before the engine is started, and its fuel property are separated and detected; therefore, a parameter, such as a fuel injection quantity at the start of the engine, can be optimized, and as a result, the exhaust performance and the running performance at the start of the engine are balanced and optimized.
  • Fig. 10 is a schematic structure diagram showing an example of an automobile engine to which an embodiment (common to other embodiments) of the control apparatus of the present invention.
  • An engine shown in this figure is a multicylinder engine, such as one with four cylinders #1, #2, #3, and #4 (See Fig. 12 ), which includes a cylinder 12 having cylinders #1, #2, #3 and #4, and pistons 15 slidable in those cylinders. Above the pistons 15, there are combustion chambers 17, and ignition plugs 35 are provided for the combustion chambers of the cylinders #1, #2, #3, and #4.
  • the air for combustion of the fuel is from an air cleaner 21 provided at an end portion of the intake passage 20, passes through an air-flow sensor and an electrically controlled valve 25, and enters a collector 27, from which the air goes into a lift-timing control type magnetic-driven intake valve 28 mounted at the downstream end of the intake passage 20, and sucked into the combustion chambers 17 of the cylinders #1, #2, #3, and #4.
  • a fuel injection valve 30 is provided at a downstream portion (intake port) of the intake passage 20.
  • a mixture of air sucked into the combustion chamber 17 and fuel supplied by the fuel injection valve 30 is burned by spark ignition by an ignition plug 35, a combustion waste gas (exhaust) is sent out from the combustion chamber 17, passes through the lift timing control type magnetic exhaust valve 48, and expelled to a separate passage 40A ( Fig. 12 ) which forms an upstream portion of an exhaust passage 40. Then, the waste gas flows through the separate passage 40A and the exhaust collector 40 into a three-way catalyst 50 of the exhaust passage 40 and is cleaned and discharged to the outside.
  • An O 2 sensor 52 is provided on the downstream side from the three-way catalyst 50 on the exhaust passage 40, and an A/F sensor 51 is provided at the exhaust collector 40B on the upstream side from the catalyst 50 on the exhaust passage 40.
  • the A/F sensor 51 has a linear output characteristic with respect to the density of oxygen included in the exhaust gas. There is an almost linear relation between the oxygen density and the air-fuel ratio in the exhaust gas. Therefore, by the A/F sensor 51 which detects the oxygen density, it is possible to obtain an air-fuel ratio in the exhaust collector 40B.
  • the control unit 100 it is possible to calculate an air-fuel ratio on the upstream side of the three-way catalyst 50 from a signal from the A/F sensor 51, and also calculates from a signal from the O 2 sensor whether or not the O 2 density is rich or lean with respect to the O 2 density on the downstream side of the three-way catalyst 50 or stoichimetric (theoretical) combustion. By using those sensors 51 and 52, the control unit performs feedback (F/B) control by sequentially compensating the fuel injection quantity and the air quantity so that the purifying efficiency of the three-way catalyst 50 become optimum.
  • Part of the exhaust gas emitted from the combustion chamber 17 to the exhaust passage 40 is introduced into the intake passage through an EGR passage 41 as necessity requires, and re-circulated back to the combustion chamber of the cylinder 17 through a branch passage of the intake passage 20.
  • An EGR valve 42 to adjust the EGR rate is inserted in the EGR passage.
  • the control apparatus 1 in this embodiment is provided with a control unit 100 which incorporates a microcomputer for various kinds of control of the engine.
  • the control unit 100 is formed basically by a CPU 101, an input circuit 102, an input/output port 103, a RAM 104, and a ROM 105 as shown in Fig. 11 .
  • Signals input to the control unit 100 are a signal corresponding to an intake air quantity detected by an air flow sensor 24, a signal corresponding to a valve travel of the throttle valve 25 detected by a throttle sensor 34, a signal representing the rotation (engine rotation number) and the phase of the crankshaft 18 sent from a crank angle sensor (rotation number sensor) 37 (The crank angle sensor 37 outputs a signal for every one degree of angle of rotation, for example), a signal from the O 2 sensor 52 provided on the downstream side from the three-way catalyst 50 in the exhaust passage 40 to express whether or not the O 2 density is rich or lean with respect to the O 2 density on the downstream side of the three-way catalyst 50 or stoichiometric (theoretical) combustion, a signal corresponding to an oxygen density (air-fuel ratio) detected by the A/F sensor 51 disposed at the exhaust collector 40B on the upstream side of the catalyst 50 in the exhaust passage 40, a signal corresponding to an engine cooling water temperature detected by a water temperature sensor 19 disposed at the cylinder 12, and
  • the control unit 100 receives outputs from the A/F sensor 51, the O 2 sensor 52, the throttle sensor 34, the air flow sensor 24, the crank angle sensor 37, the water temperature sensor 37, the water temperature sensor 19, and the accelerator sensor 36. According to the sensor outputs, the control unit 100 recognizes the operating conditions of the engine, and on the basis of the operating conditions, the control unit 100 calculates an intake air quantity, a fuel injection quantity, and main manipulated variables of the engine for ignition timing. A fuel injection quantity calculated in the control unit 100 is converted into a valve opening pulse signal, and sent through a fuel injection valve drive circuit 117 to the fuel injection valve 30. A drive signal is sent from an ignition output circuit 116 to the ignition plugs 35 so that ignition takes place at ignition timing calculated by the control unit 100.
  • signals are processed to remove noise in the input circuit 102 and sent to the input/output port 103.
  • Values at the input ports are stored in a RAM 104 and sent to undergo an arithmetic process in the CPU 101.
  • a control program having contents of the arithmetic process described in it is previously written in a RAM 105.
  • Values representing manipulated variables of the actuators calculated according to a control program are stored in the RAM 14 and sent to the output port 103.
  • an ON/OFF signal is used which is set to ON when the primary side coil of the ignition output circuit 116 is conducting and which is set to OFF when the primary side coil is non-conducting.
  • the ignition timing is a time in point that the signal goes from the ON level to the OFF level.
  • a signal for the ignition plug 35 set in the output port 103 is amplified in the ignition output circuit 116 to a sufficient energy required for ignition and sent to the ignition plug 35.
  • an ON/OFF signal is used which is set to ON to open the valve and which is set to OFF to close the valve.
  • This signal is amplified at the fuel injection valve drive circuit 117 to a sufficient energy to open the fuel injection valve 30 and supplied to the fuel injection valve 30.
  • a drive signal to realize a target opening of the electrically-controlled throttle valve 25 is sent through an electrically-controlled throttle drive circuit 118 to the electrically-controlled throttle valve 15.
  • An input circuit and a drive circuit are provided for each of the lift timing control type magnetic-driven intake vale, and the lift timing control type magnetic exhaust valve, though they are not shown.
  • Fig. 12 is a diagram of the control system in a first embodiment.
  • the control unit 100 includes a basic fuel injection quantity (Tp) calculating unit 121, an air-fuel ratio correction amount (Lalpha) calculating unit 122, an air-fuel ratio feedback (F/B) correction amount calculating unit 123, a first evaporation rate detection permission deciding unit 130, an engine speed increase index calculating unit 140, a first evaporation rate detecting unit 150, a second evaporation rate detection permission detecting unit 160, a frequency response characteristic calculating unit 170, a second evaporation rate detecting unit 180, and a residual fuel quantity and a fuel property detecting unit 190.
  • Tp basic fuel injection quantity
  • Lalpha air-fuel ratio correction amount
  • F/B air-fuel ratio feedback
  • An individual cylinder fuel injection quantity Ti is calculated so that an air-fuel ratio in combustion of all cylinders is a theoretical air-fuel ratio by using the above-mentioned basic fuel injection quantity Tp and air-fuel ratio term Lalpha.
  • the first evaporation rate is obtained from an integrated value of engine speed in a predetermined period after initial combustion at the start of the engine as described later.
  • the first evaporation rate is affected by both a residual fuel and a fuel property as described above.
  • the second evaporation rate is obtained from a response characteristic of an air-fuel ratio after passage of a predetermined time after the engine is started, in other words, in a period that a detection result is affected only by the fuel property without any effect from the residual fuel.
  • a target air-fuel rate is vibrated by a predetermined frequency and on the basis of a predetermined frequency component of an output signal from the A/F sensor 51, a fuel property is estimated. More specifically, the heavier the fuel property is, the smaller the predetermined frequency component (power spectrum) becomes.
  • This calculating means 121 calculates a fuel injection quantity which simultaneously realizes a target torque and a target air-fuel ratio under optional running conditions on the basis of an intake air quantity detected by the air flow sensor 24.
  • a basic fuel injection quantity Tp is calculated.
  • a basic fuel injection quantity is calculated both when complete combustion has been achieved and when complete combustion has not been achieved. Complete combustion may be regarded as achieved when the engine revolution is greater than or equal to a predetermined value and if this continues for a predetermined period.
  • a basic injection quantity is calculated by an engine cooling water temperature (Twn) and a fuel property index (Ind_Fuel), and a basic injection quantity is adjusted on the basis of a residual fuel quantity (Red_Fuel).
  • Twn engine cooling water temperature
  • Ind_Fuel fuel property index
  • Red_Fuel residual fuel quantity
  • K in a calculation formula of a basic fuel injection quantity Tp in complete combustion is a constant and is a value to be adjusted to always realize a theoretical air-fuel ratio for any inflow air quantity.
  • Cyl denotes the number of cylinders of the engine (4 here).
  • the unit 130 makes a decision as to whether to give a permission to detect a first evaporation rate.
  • Nedag1L is a value somewhat larger than an engine speed obtained by only torque of the starter motor and a value (200rpm) less than or equal to an engine speed obtained by a so-called initial combustion.
  • Ta[s] is set to about 1s to 2s as a rule of thumb. Because Twndag needs to be in a temperature range where it is subject to effects of fuel property, and therefore needs to be at least 60°C or lower, preferably 40°C or lower.
  • This calculating unit 140 calculates an engine speed increase index.
  • a first evaporation rate detection permission flag (Fpdag1) is set to 1
  • a process of integrating the engine speed is performed.
  • This detection unit 150 detects (calculates) a first evaporation rate.
  • the detection means 150 calculates a first evaporation rate (Ind_Fuel1) from an engine speed increase index (Sne) and an engine cooling water (Twn)by referring to a map.
  • This unit 160 makes a decision whether to give a permission to detect a second evaporation rate.
  • a second evaporation rate needs to be detected under a condition that it is affected only by fuel property.
  • the residual fuel remaining in the cylinder before start-up is burned in a short period after the engine is started, the second fuel evaporation rate needs to be detected after a predetermined time elapses after the engine is started.
  • Tb[s] is set to about 5s as a rule of thumb.
  • Tc [s] which corresponds to a detection time, is preferably considered to be 2s to 10s on an experimental basis depending on the S/N ratio of output from the A/F sensor 51, which will be described later.
  • Twndag which needs to be in a temperature range where a detection result is affected by fuel property, must be at least less than or equal to 60°C, preferably 40°C or less.
  • an air-fuel ratio correction term Lalpha is calculated by PI control from a deviation Dltabf between a value, obtained by multiplying a target air-fuel ratio Tabf by an air-fuel correction term Chos, and an air-fuel ratio detected by the A/F sensor.
  • the air-fuel ratio correction term Laslpha is multiplied by the basic fuel injection quantity Tp described above. Detail of the calculation of the air-fuel ratio change amount Chos, which will be described later, changes in a manner to cause the target air-fuel ratio to vibrate periodically when the second evaporation rate is detected.
  • KchosR and KchosL should preferably be determined considering the running performance and the exhaust performance.
  • This calculating unit 170 analyses frequencies of output signal from the A/F sensor 51 when permission to detect a second evaporation rate is granted.
  • power spectrum ( gain characteristic)
  • Power (fa_n) of frequency fa_n is calculated by supplying an output signal of the A/F sensor 51 to a DFT (Discrete Fourier Transform) processor.
  • DFT Discrete Fourier Transform
  • FFT Fast Fourier Transform
  • This unit 180 detects (calculates) a second evaporation rate.
  • a second evaporation rate (Ind_Fuel2) is calculated from Power (fa_n) and an engine cooling water temperature (Twn) by referring to a map.
  • This unit 190 detects (calculates) a residual fuel quantity and a fuel property.
  • a residual fuel quantity Red_Fuel is obtained from a ratio of Ind_Fuel1 and Ind_Fuel2 by referring to a map.
  • a fuel property index Ind_Fuel is obtained from Ind_Fuel2 and Twn by referring to the map.
  • a detection result Ind_Fuel1 by the first fuel evaporation rate detecting means 150 which is obtained in a predetermined time after the start of the engine, includes both a burned fuel quantity supplied from the fuel injection valve 30 and a burned fuel quantity (residual fuel quantity) other than the fuel supplied from the fuel injection valve 30.
  • a detection result Ind_Fuel2 by the second fuel evaporation rate detecting means 180 which is obtained after the engine is started and a predetermined time elapses, is not affected by the residual fuel quantity but affected only by the burned fuel quantity supplied from the fuel injection valve 30, namely, the fuel property.
  • combustion fuel quantities are detected in different periods where degrees of effects differ with different effect factors, and by comparing detection results, the effects of the residual fuel are separated from effects of the fuel property. Because the first evaporation rate Ind_Fuel1 is greater (higher) than the second evaporation rate Ind_Fuel2 by an amount corresponding to the quantity of the residual fuel. Therefore, only when this condition is established, a decision is made that the residual fuel quantity exists, and the residual fuel quantity Red_Fuel is obtained. Note that a map used to obtain Red_Fuel and Ind_Fuel may be formed on an experimental basis.
  • an engine speed (revolution number) increase index at engine start-up was used when the first evaporation rate was detected.
  • an air-fuel ratio is used when a first evaporation rate is detected. More specifically, a burned fuel quantity is detected from a difference or a ratio between the air-fuel ratio in fuel supply to the engine and the air-fuel ratio detected on the emission side.
  • Fig. 23 is a diagram of a control system in the second embodiment, and for detecting a first evaporation rate, an air-fuel ratio is used as described; therefore, a calculating unit of a difference in air-fuel ratio at inlet and outlet 210 is provided in place of the engine speed increase index calculating unit in the first embodiment.
  • This calculating unit 210 calculates a difference in an air-fuel ratio at inlet and outlet. More specifically, as shown in Fig. 24 , when the first evaporation rate detection permission flag (Fpdag1) is set to 1, an inlet air-fuel ratio Rin is obtained from a ratio between a final fuel injection quantity and a basic fuel injection quantity Tp, and a difference (in fact, a ratio) Raf in air-fuel ratio between inlet and outlet is obtained from the inlet air-fuel ratio Rin and the exhaust air-fuel ratio Rabf.
  • This unit 250 detects (calculates) a first evaporation rate. More specifically, as shown in Fig. 25 , a first evaporation rate (Ind_Fuell) is calculated from an inlet/outlet air-fuel ratio difference (Raf) and an engine cooling water temperature (Twn) by referring to a map.
  • the values of the map which represent the relation between an inlet/outlet air-fuel ratio difference (Raf) and a first evaporation rate (air-fuel ratio), depend on engine specifications and may be determined on an experimental basis.
  • a third embodiment there is provided means for notifying abnormality on the basis of the quantity of residual quantity.
  • the residual fuel quantity is greater than or equal to a predetermined value, abnormality is annunciated because the oil-tightness of the fuel injection valve is likely to have deteriorated and there are worries about the quantity of HC evaporating to the outside (atmospheric air) of the engine while the engine is at rest, for example.
  • a timer 107 capable of measuring time even during engine stoppage is added to the control unit 100 in the first and second embodiments.
  • an alarm drive circuit 119 and an alarm lamp 27 as an annunciating means, for example, are provided.
  • Fig. 27 is a diagram of a control system in the third embodiment, and as described above, a calculating means pf history during stoppage time 310 and an alarm lamp 127 for notification to the outside which occurs based on the residual fuel quantity are added to the first embodiment.
  • This calculating unit 310 performs an arithmetic operation related to history of the environment, such ass water temperature and intake temperature during engine stoppage. More specifically, as shown in Fig. 28 , when the engine is at rest, in other words, the engine revolution number is zero, the calculating means calculates engine stoppage time, and calculation of cumulative time of presence of each water temperature range and each intake air temperature range.
  • the cumulative time of presence of each of water temperature ranges is, for example, cumulative time of water temperature staying in a range of 0°C to 10°C or in a range of 10°C to 20°C during engine stoppage, and this data is used to take into consideration the effect factors that the fuel remaining in the intake passage has on the evaporation rate.
  • This unit 390 detects (calculates) a residual fuel quantity and a fuel property.
  • a residual fuel quantity Red_Fuel is obtained from a ratio between Ind_Fuel1 and Ind_Fuel2 by referring to a map.
  • a fuel property index Ind_Fuel is obtained from Ind_Fuel2 and Twn by referring to the map.
  • the fuel evaporation detected by the first fuel evaporation rate detecting unit 150 is apparently higher than the second fuel evaporation rate detecting unit 180 by an amount corresponding to the residual fuel quantity.
  • this relation is reversed, in other words, if the fuel evaporation rate detected by the first fuel evaporation rate detecting unit 150 is apparently lower than the fuel evaporation detected by the second fuel evaporation rate detecting unit 180, it is possible to make an arrangement so that a decision can be made that an engine abnormality has occurred which leads to a deterioration of the fuel evaporation rate, and abnormality is notified.
  • the above-described aspects may be combined in any manner suitable to put the invention to practice according to the understanding of those skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP06013736A 2005-07-01 2006-07-03 Engine control apparatus Expired - Fee Related EP1741908B1 (en)

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JP2005194179A JP4464876B2 (ja) 2005-07-01 2005-07-01 エンジンの制御装置

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US20070016357A1 (en) 2007-01-18
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DE602006009581D1 (de) 2009-11-19
EP1741908A1 (en) 2007-01-10
JP4464876B2 (ja) 2010-05-19
US7664591B2 (en) 2010-02-16
CN1892006A (zh) 2007-01-10

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